A former male escort with a penchant for dressing up in uniform was convicted this week of killing a man he lured to his doom using a dating app.

London resident Jason Marshall, 28, was found guilty Wednesday for the 2013 murder of Peter Fasoli, who he met on the app Badoo — and whose credit cards he used to flee to Rome to kill another, the Guardian reported.

Jurors in the London trial heard how Marshall dressed up in uniform – sometimes as a ticket inspector or air cadet – because he loved the respect it earned him.

The deranged killer was impersonating a police officer when he visited Fasoli, 58, Jan. 6, 2013 at his home, where he gagged and suffocated the computer repairman with plastic wrap.

Marshall set the home on fire, leading investigators to rule Fasoli’s death an accident for nearly two years. That was until Fasoli’s nephew unearthed damning footage of the murder, which was captured on CCTV on his uncle’s computer hard drive.

Twenty days after Fasoli’s death, Marshall strangled another man, Vincenzo Iale, 67, in his Rome home and took off with his credit card and car, the outlet reported.

A week later, he contacted a third man, Umberto Gismondi, on Badoo and arranged to meet for sex.

Marshall dressed as a British embassy official and attacked Gismondi with a baton and pepper spray before trying to smother him to death.

Gismondi managed to get away unscathed – and Marshall was eventually convicted by an Italian court in his attempted murder and the murder of Iale.

Marshall was already serving a 16-year sentence after he was found guilty in July 2014 of Iale’s murder and the attempted murder of Gismondi when he was sent back to England for Fasoli’s murder.

But human rights campaigner Peter Tatchell said the killer shouldn’t have been free to commit any more crimes in the first place.

“There appears to have been missed opportunities and serious failings of the police investigation. Why did they not check the victim’s mobile phone, computer, bank transactions and CCTV?” Tatchell said. “Yet again we are hearing about the horrific killing of a gay man where the police seem to have not followed quite basic investigative procedures.”